Sewing machine



July 27 1943- w. K. R. lar-:YER `2,325,467`

SEWING MACHINE .Filed May 24, 1940 IN1/EN TORJ WERNER KURT Rana/f BEYERPatented July 27, 1943 SEWING MACHINE Werner'Kurt Rudolf Beyer, Dresden,Germany; vested in the Alien Property Custodian Application May 24,1940, serial No. 236,944

6 claims. y (CL112-192) This invention relates to a sewing machine forfamily use with a new improved means for actuating the oscillatingshuttle.

The device consists of a driven cam, the cam carrier of which rotates.This cam changes the rotating motion of the sewing machine drive shaftinto the reciprocatory motion required for the shuttle bymeans of arocker which is connected to the shuttle by means of a rod.

Devices for shuttle motivation already known generally employ cam orcrank driven power which often becomes noisy because of the highacceleration at the points where the motion reverses, and on account ofthe necessary joints of the up and down moving rod. Compared with suchdevices this present invention provides a shuttle motive-power, whichmoves the system of rods connected with the shuttle in a vertical plane.Thus the speed of the driven parts can be regulated at will at differentpoints of their paths and results in an extremely even and noiselessmotion.

This invention has at the same time the advantage, contrary to otherknown devices which employ cams of comparatively small size so that itcan be mounted almost anywhere in the path of motion. of the shuttledrive.

This brings about another advantage, namely, that it can be built intoany lock stitch sewing machine, whereas devices with cam gears can beused only with chainstitch sewing machines in which the loopcatchertravels only short distances.

One form of the invention is shown by the accompanying drawing of whichFig. 1 shows a longitudinal section through the machine illustrating theshuttle actuating mechanism,

Fig. 2 shows the shuttle of the machine.

On the bedplate I of the sewing machine is mounted the arm 2. In thelateral part of the arm 2 is lsituated the'main shaft 3. On this shaft 3is fastened a bevel gear 4 which engages another bevel gear 5 which isfastened to the upper end of a perpendicular connecting shaft 6. Thisperpendicular connecting shaft is within the perpendicular part of thearm 2 and rotates in two bearings 1 and 8. At the lower end of shaft 6is fastened a revolving part 9 in the shape of a segment of a hollowsphere. The surface I0 of which cuts the axis of the perpendicularconnecting shaft 6 at an acute angle.

Below the center of the revolving part and in this case in the center ofthe curve of the segment of the hollow sphere is a, shaft II supportedby JIA two bearings I2 and I3. (The bearing I3 is not shown in thedrawing). These bearings are parts of a frame I4 which is held to thebottom of the bedplate I by screws. Between the-bearings I2 and I3 is aT-shaped swinging part or rocker I5 -having at its two lateral ends I6and I1 small rollers I8 and I9. 'I'hese rollers I8 and I9 ride on thesurface I0 of the revolving part 9. From the center of the rocker I6between the two arms I6 and Il extends at a right angle a third arm 20.At the end of this arm 20 is jointed a rod 2| which is provided at itsfree end with a rack 2Ia. Rack 2Ia slides to and fro in the extensions23 and 24 of a hanger 22 loosely suspended from an axle 25 for theshuttle. Between the lateral bearings 23 and 24 is a pinion 26 or thesegment n of a, pinion which is fastened to the axle 25.

Axle 25 for the shuttle is supported in a bearing 21 which is cast as apart ofthe bedplate I.

To the free end of the axle 25 for the shuttle is fastened the drivingdevice 28 with the shuttle 29. In the shuttle. 29 is the ordinary bobbincase 30 and bobbinl. The bearing 22, the pinion 26, the axle 25 for theshuttle, the driving device 28 'and the shuttle 29 are a unit in ahousing 32. This housing 32 with the bobbincase 30 and the bobbin 3| isclosed by means of a ring 33 which is fastened to the frontal part ofthe housing 32 by means of a screw 34 under which a springplate 33apresses against the ring 33. This ring 33 preventsthe shuttle 29 fromfalling out of the housing.

For the driving of the sewing machine a driving wheel equipped with abelt-groove 6I is mounted on the free end of the main shaft 3. At theopposite end of the main shaft 3 is an eccentric crank 62, firmlyattached to which is a peg 63 having a lateral projection into which asecond peg 64 is screwed. To this peg 64 is attached a lever 65. To theother end of this lever 65 is mounted a clamp 66 which passes tightlyaround the needle bar 61. The take-up lever 68 is movably mounted on thepeg 63. A lever 69 is connected with the take-up lever 68. This lever69, which is movably mounted on bolt 'IIJ fastened into the frame of themachine, serves to guide the take-up lever 68.

Having described my invention, I claim:

1. In a household sewing machine the combination of a bedplate, an armmounted on this bedplate, a main driving shaft in this arm, aperpendicular connecting shaft, means to transmit the motion of the saidmain driving shaft to the connecting shaft, a segment of a hollow sphereattached to the lower end of the perpen-v dicular shaft, said segmenthaving a surface which cuts the axis of the perpendicular shaft at anacute angle, transforming meansto convert the revolving motion of saidsegment into a to and fro motion, an oscillating shuttle, a rod drivenby the said transforming means, and a device at the end of the said rodto oscillate said shuttle.

2. In a household sewing machine a bedplate, an arm mounted on thisbedplate, a main driving shaft in this arm, a perpendicular connectingshaft, a pair of bevel gears to transmit the motion of the said maindriving shaft to the perpendicular connecting shaft, a revolving partattached to the lower end of this perpendicular connecting shaft in theshape of a segment of a hollow sphere which segment has a surface whichcuts the axis of the perpendicular connecting shaft at an acute angle, aswinging part in the shape of the letter T, a frame fastened to theunder-side of the bedplate with means for holding the swinging part,means at the lateral ends of the said swinging part which means travelon the surface of the segment of the hollow sphere, a rod driven by thesaid swinging part, an oscillating shuttle, and a device at the end ofthe said rod to set in motion the oscillating shuttle. v

3. 1n a household sewing machine a bedplate, an arm mounted on thisbedplate, a main driving shaft in this arm, a perpendicular connectingshaft, a pair of bevel gears to transmit the motion of the said maindriving shaft to the perpendicular connecting shaft, a revolving part atthe lower end of this perpendicular connecting shaft in the shape of asegment of a hollow sphere which segment has a surface which cuts theaxis of the perpendicular connecting shaft at an acute angle, a swingingpart in the shape of the letter T, a frame fastened to the underside ofthe bedplate with means for holding the swinging part, rollers mountedat the lateral ends of the said swinging part, which rollers travel onthe surface of the segment of the hollow sphere, a rod driven by thesaid swinging part, an oscillating shuttle, and a device at the end ofthe said rod to set in motion the oscillating shuttle.

4. In a household sewing machine a bedplate, an arm mounted on thisbedplate, a main driving shaft in this arm, a perpendicular connectingshaft, a pair of bevel gears to transmit the motion of the said maindriving shaft to the perpendicular connecting shaft, a revolving part atthe lower end of this perpendicular connecting shaft in the shape of asegment of a hollow sphere which segment has a surface which cuts theaxis of the perpendicular connecting shaft at an acute angle, a swingingpart in the shape of the letter T, a frame fastened to the underside ofthe bedplate with means for holding the swinging part, rollers mountedat the lateral ends of the said swinging part which rollers travel onthe surface of the segment of the hollow sphere, a rod movably connectedwith the perpendicular part of the T-shaped swinging part which rod hasa rack at its free end, a shuttle and a pinion engaging said rack foroscillating said shuttle.

5. In a household sewing machine a bedplate, an arm mounted on thisbedplate, a main driving shaft in this arm, a perpendicular connectingshaft, a pair of bevel gears to transmit the motion of the said maindriving shaft to the perpendicular connecting shaft, a revolving part atthe lower end of this perpendicular connecting shaft in the shape of asegment of a hollow sphere which segment has a surface which cuts theaxis of the perpendicular connecting shaft at an acute angle, a swingingpart in the shape of the letter T, a frame fastened to the under side ofthe bedplate with means for holding the swinging part, rollers mountedat the lateral ends of the said swinging part which rollers travel onthe surface of the segment of the hollow sphere, a rod movably connectedwith the perpendicular member of the T-shaped swinging part which rodhas a rack adjacent its free end, a shuttle and a pinion engaging withsaid rack adapted to impart an oscillating motion to the shuttle.

6. In a household sewing machine, the combination of a bed-plate, an armmounted on the bed-plate, a main driving shaft in said arm, a connectingshaft, means to transmit the motion of the main driving shaft to theconnecting shaft, a cam attached to the lower end of the connectingshaft, a rocker provided with arms for engaging said cam, a crankswingable in a vertical plane on said rocker, a rod, one end of which ispivotally attached to said crank, a rack on the other end of said rod, apinion meshing with said rack, and a shuttle attached to said pinion soas to be rotatable therewith.

WERNER KURT RUDOLF BEYER.

